I haven't been able to figure this one out. I'm not sure if it's a bug or if there's something hidden that I'm not seeing. I've noticed that some users' (usually new users but not always) profiles will show a message count (post count) that is 1 more than their actual message count. Here is a current example: SPG Champion 2's profile currently shows a message count of 3, but if I view a list of her posts, I only see 2. I think (but am not certain) that this count automatically gets corrected once the user makes a few more posts.